Coal-mining apparatus



une 1,7 ,-1924 n 1,',498 fr" M. P. STRETAUSKY n com. MINING APPARATUS .med July 24. 1920 Patented June 17, i924.

iran srarsfs PATEN MMAQ COAL-MINING APPARATUS.

Application filed July 24, 1920. SerialvNo. 398,643.

T 0 all cfu/wm t may concern.'

Be it known that I, MICHAEL P. SrRET- AUSKY, a citizen of the United States, residing at Parsons, Luzerne County, State of Pennsylvania, have'invented certain new and useful Improvements in Coal-Mining Apparatus, of which thepfollowing is a specification.

This invention relates to coal mining apparatus particularly to such apparatus used in drilling holes in the coal in preparation for blasting operations. The great bulk of the coal mined is loosened by blasting with powder or dynamite, the holes into which the explosive is placed being drilled by power drills manually manipulated by the miners. The most satisfactory type of power drill utilized is operated by compressed air but this has the well known disadvantage of subjecting the operator to excessive shock which, in time often results in serious injury to the nervous system. To cut down the shock to the minimum the coal miners generally utilize drills of small diameter, such as rock drills, instead of the coal drills especially provided for this purpose, which are considerably larger in diameter. The resulting hole being of small diameter, the desired breaking effect in blasting can only be obtained by the use of dynamite instead of black powder inasmuch as an amount of the black powder sufficient for the purpose cannot be placed in the small sized hole. Dynamite, being a much more powerful explosive than black powder, pulverizes the coal to a much greater extent and causes great wastage, and it also burns the coal in an objectionable manner.

The object of the present invention is to provide a simple and inexpensive apparatus to be used in conjunction with the compressed air drills now in commonuse, whereby the drills may be used without shock to the operator enabling him to drill a hole of any desired size and which permits the operator to put any desired pressure on the drill to obtain a maximum drilling speed.

One embodiment of the invention will be disclosed in the following description when taken with the accompanying drawings in which,

Figure 1 is a side view of the apparatus as set up in a mine, and

Figure 2 is a top View of the same, partly broken away.

A pneumatic drill of anyusual construction is indicated at 10f'in the drawingsand this drill rests upon a table 11 having a supporting leg 12 secured toits forward end and pivotally supported at its rear end upon a cross piece 13, the ends of which are provided with attached supporting legs 14C. Table 11 isprovided with a series of holes 15 and cross piece 13 has a series of holes 16 extending' longitudinally thereof, the holes 15 and 16 being of the same size. and adapted to receive a pin 17 which constitutes a pivot about which the table 11 may be swung. justed forwardly side to side by removing the pin 17, bringing any two holes in the table` and cross piece into registry and reinserting the pin. Adjustable mine jacks 18 extending from floor to roof are positioned in rear of the cross piece to prevent the rearward movement thereof in the operation of the device. Positioned in rear of the table 11 and its supporting members is a windlass19 of any suitable type, anchored to the floor as by a chain and pin or fastened to a mine timber, and the windlass and pneumatic drill are connected by means of a rope or other flexible connector 2O having one end secured to the drill and the other wound on the drum of the windlass, the rope passing thru an aperture near the forward end of the table 11 and over a pulley 21 located at that point. In the operation of the apparatus one operator stands beside the table 11 and guides the drill, which is resting therein,

The table 11 may be adland a second operator turns the handle of the windlass to advance the drill toward the wall of coal which it faces. -Any desired pressure may be placed on the drill point by the windlass operator. Obviously neither operator is subjected to the shock of the drill'and in case a hemp rope is utilized but little vibration is conveyed to the windlass due to the elasticity of the rope. The

and rearwardly and from table may be swung about pivot 17 or moved from side to side in boring holes at dierent points and at different angles.

Having thus described the invention what is claimed as new and desired to be secured transversely of and supporting` the rear ofl said support, adjustable means for connecting said support and said member, means preventing rearward movement of said member, a windlass adapted to be fastened to the mine,` floor, and a flexible member connecting said windlass and said drill and passing around the forward end of said support.

2. In coal miningapparatus, in combination, an air drill of the manually operated type, a board on which the drill freely rests,

a leg adapted to support the forward end of said board, a horizontal member supported at each end by a leg and arranged transversely of the board to support its rear end, holes in said board and member, a pin adapted to pass through a selected hole in said board andsaid member to adjustably connect them together, a pair of vertical mine jacks abutting the rear of said member, a pulley on the forward end of said board, a windlass adapted to be fastened to the mine floor behind said jacks and a rope connected to thel rear of said drill, passing around said pulley and connected to said windlass.

In testimony whereof I affix my signature.

MICHAEL P. STRETAUSKY. 

